| National Weather Service Forecast for:
San Marcos CA Issued by: National Weather Service San Diego, CA |
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| Updated: 12:56 pm PST Dec 17, 2025 | ||||||||||||||||||
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| Tonight |
Mostly clear, with a low around 52. Calm wind. |
| Thursday |
Sunny, with a high near 80. Northeast wind around 5 mph becoming west in the afternoon. |
| Thursday Night |
Mostly clear, with a low around 54. East wind around 5 mph becoming calm. |
| Friday |
Sunny, with a high near 75. Calm wind becoming southwest around 5 mph in the afternoon. |
| Friday Night |
Partly cloudy, with a low around 51. Calm wind. |
| Saturday |
Mostly sunny, with a high near 71. |
| Saturday Night |
Patchy fog after 4am. Otherwise, partly cloudy, with a low around 52. |
| Sunday |
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 72. |
| Sunday Night |
Patchy fog after 10pm. Otherwise, partly cloudy, with a low around 51. |
| Monday |
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 70. |
| Monday Night |
Mostly cloudy, with a low around 51. |
| Tuesday |
A slight chance of showers. Partly sunny, with a high near 67. |
| Tuesday Night |
A chance of showers. Mostly cloudy, with a low around 53. |
| Wednesday |
Showers likely. Mostly cloudy, with a high near 68. |
Forecast from NOAA-NWS for San Marcos CA.
